JPH021465U - - Google Patents
Info
- Publication number
- JPH021465U JPH021465U JP7733288U JP7733288U JPH021465U JP H021465 U JPH021465 U JP H021465U JP 7733288 U JP7733288 U JP 7733288U JP 7733288 U JP7733288 U JP 7733288U JP H021465 U JPH021465 U JP H021465U
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- fuel
- valve
- fuel injection
- flat
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000446 fuel Substances 0.000 claims description 27
- 238000002347 injection Methods 0.000 claims description 11
- 239000007924 injection Substances 0.000 claims description 11
- 238000013016 damping Methods 0.000 claims description 4
- 125000006850 spacer group Chemical group 0.000 description 1
Landscapes
- Fuel-Injection Apparatus (AREA)
Description
第１図は本考案の一実施例による燃料噴射弁１
の縦断面図、第２図は同、フラツトダンピング機
構３０部分の要部拡大断面図、第３図は第２図の
―線断面図、第４図はフラツトバルブ３２の
斜視図、第５図はフラツトダンピング機構３０の
作動状態の要部拡大断面図、第６図はポンプ回転
数に対する高圧燃料室内の圧力Ｐｔの関係を示す
グラフ、第７図は同じくポンプ回転数に対するニ
ードル弁１４を押圧する合力の関係を示すグラフ
、第８図はニードル弁１４のリフト量に対するニ
ードル弁１４を押圧する合力の関係を示すグラフ
、第９図は本考案の他の実施例による燃料噴射弁
４０の縦断面図、第１０図は同ニードル弁１４の
リフト量に対するニードル弁１４を押圧する合力
の関係を示すグラフ、第１１図は本考案のさらに
他の実施例による燃料噴射弁５０の縦断面図、第
１２図は同、ニードル弁１４のリフト量に対する
ニードル弁１４を押圧する合力の関係を示すグラ
フである。
１……燃料噴射弁、２……ノズルホルダヘツド
、２Ａ……燃料入口、２Ｂ……圧力導入口、２Ｃ
……リークオイル出口、２Ｄ……圧力通路、２Ｅ
……燃料通路、２Ｆ……リークオイル通路、２Ｇ
……フラツトダンピング機構３０の装着孔、３…
…シリンダ、３Ａ……嵌装孔、３Ｂ……燃料通路
、３Ｃ……リークオイル通路、４……ノズルホル
ダ本体、４Ａ……嵌装孔、４Ｂ……燃料通路、５
……デイスタンスピース、５Ａ……燃料通路、６
……ノズルボデイ、６Ａ……ガイドホール、６Ｂ
……ボデイシート面、６Ｃ……噴口、６Ｄ……燃
料通路、６Ｅ……燃料溜り室、７……締付けナツ
ト、８……ノズルホルダ、９……リテーニングナ
ツト、１０……燃料噴射ポンプ、１１……デリバ
リバルブホルダ、１２……噴射管、１３……導管
、１４……ニードル弁、１４Ａ……ニードルシー
ト面、１４Ｂ……プレツシヤステージ、１５……
セントラルプランジヤ、１６……プレツシヤピン
、１７……第１のプレツシヤスプリング、１８…
…受圧ピストン、１９……第２のプレツシヤスプ
リング、２０……スプリングシート、３０……フ
ラツトダンピング機構、３１……バルブボデイ、
３１Ａ……貫通孔、３１Ｂ……大径の貫通孔、３
１Ｃ……フラツトバルブストツパ面、３２……フ
ラツトバルブ、３２Ａ……オリフイス、３２Ｂ…
…中央平面部、３３……バルブシート、３３Ａ…
…貫通孔、３３Ｂ……オリフイス、３４……取付
けボルト、３４Ａ，３４Ｂ，３４Ｃ……貫通孔、
３５……燃料戻し用通路、４０，５０……燃料噴
射弁、５１……スペーサ、Ｐｔ……高圧燃料室内
の油圧、ＰＬ……プレリフト量、ＦＬ……フルリ
フト量、ＭＬ……メインリフト量。
FIG. 1 shows a fuel injection valve 1 according to an embodiment of the present invention.
2 is an enlarged sectional view of the main part of the flat damping mechanism 30, FIG. 3 is a sectional view taken along the line -- in FIG. 2, FIG. 4 is a perspective view of the flat valve 32, and FIG. 6 is a graph showing the relationship between the pressure Pt in the high pressure fuel chamber and the pump rotation speed, and FIG. 7 is a graph showing the relationship between the pressure Pt in the high pressure fuel chamber and the pump rotation speed. 8 is a graph showing the relationship between the resultant force pressing the needle valve 14 and the lift amount of the needle valve 14. FIG. 9 is a longitudinal section of a fuel injection valve 40 according to another embodiment of the present invention. 10 is a graph showing the relationship between the lift amount of the needle valve 14 and the resultant force pressing the needle valve 14; FIG. 11 is a vertical sectional view of a fuel injection valve 50 according to still another embodiment of the present invention; FIG. 12 is a graph showing the relationship between the lift amount of the needle valve 14 and the resultant force pressing the needle valve 14. 1... Fuel injection valve, 2... Nozzle holder head, 2A... Fuel inlet, 2B... Pressure introduction port, 2C
...Leak oil outlet, 2D...Pressure passage, 2E
...Fuel passage, 2F...Leak oil passage, 2G
...Mounting hole of flat damping mechanism 30, 3...
...Cylinder, 3A...Fitting hole, 3B...Fuel passage, 3C...Leak oil passage, 4...Nozzle holder body, 4A...Fitting hole, 4B...Fuel passage, 5
... Distance piece, 5A ... Fuel passage, 6
...Nozzle body, 6A ...Guide hole, 6B
...Body seat surface, 6C ... Nozzle, 6D ... Fuel passage, 6E ... Fuel reservoir chamber, 7 ... Tightening nut, 8 ... Nozzle holder, 9 ... Retaining nut, 10 ... Fuel injection pump, 11... Delivery valve holder, 12... Injection pipe, 13... Conduit, 14... Needle valve, 14A... Needle seat surface, 14B... Pressure stage, 15...
Central plunger, 16... Pressure pin, 17... First pressure spring, 18...
...Pressure receiving piston, 19...Second pressure spring, 20...Spring seat, 30...Flat damping mechanism, 31...Valve body,
31A...Through hole, 31B...Large diameter through hole, 3
1C... Flat valve stopper surface, 32... Flat valve, 32A... Orifice, 32B...
...Central plane part, 33...Valve seat, 33A...
...Through hole, 33B...Orifice, 34...Mounting bolt, 34A, 34B, 34C...Through hole,
35... Fuel return passage, 40, 50... Fuel injection valve, 51... Spacer, Pt... Oil pressure in the high pressure fuel chamber, PL... Pre-lift amount, FL... Full lift amount, ML... Main lift amount.
Claims (1)
入口、および機関の回転数にほぼ比例して変化す
る前記燃料噴射ポンプの高圧燃料室内の圧力を導
入する圧力導入口を有するノズルホルダと、 このノズルホルダにより支持するとともに、前
記燃料入口に連通する燃料の噴口を有するノズル
ボデイと、 このノズルボデイに摺動可能に収納し第１およ
び第２のプレツシヤスプリングにより前記噴口を
閉じる方向に付勢したニードル弁と、 このニードル弁と一体的に摺動可能なセントラ
ルプランジヤとを有する燃料噴射弁であつて、 前記高圧燃料室内の圧力を受圧可能であるとと
もにこの圧力を前記セントラルプランジヤに伝達
可能な受圧ピストンと、 この受圧ピストンと前記圧力導入口との間に設
けた可動なフラツトバルブおよびこのフラツトバ
ルブがシートするバルブシートとを有するととも
に、これらフラツトバルブおよびバルブシートに
それぞれオリフイスを形成したフラツトダンピン
グ機構を設けたことを特徴とする燃料噴射弁。[Claims for Utility Model Registration] A fuel inlet that introduces high-pressure fuel from a fuel injection pump, and a pressure inlet that introduces the pressure inside the high-pressure fuel chamber of the fuel injection pump that changes approximately in proportion to the engine speed. a nozzle body supported by the nozzle holder and having a fuel nozzle communicating with the fuel inlet; The fuel injection valve has a needle valve biased in a closing direction and a central plunger that is slidable integrally with the needle valve, and is capable of receiving pressure within the high-pressure fuel chamber and transmitting this pressure to the central plunger. It has a pressure receiving piston that can be transmitted to the plunger, a movable flat valve provided between the pressure receiving piston and the pressure introduction port, and a valve seat on which the flat valve seats, and an orifice is formed in each of the flat valve and the valve seat. A fuel injection valve characterized by being equipped with a flat damping mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7733288U JPH021465U (en) | 1988-06-13 | 1988-06-13 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7733288U JPH021465U (en) | 1988-06-13 | 1988-06-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH021465U true JPH021465U (en) | 1990-01-08 |
Family
ID=31302326
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7733288U Pending JPH021465U (en) | 1988-06-13 | 1988-06-13 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH021465U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0412165A (en) * | 1990-04-27 | 1992-01-16 | Nippondenso Co Ltd | Fuel injection device |
-
1988
- 1988-06-13 JP JP7733288U patent/JPH021465U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0412165A (en) * | 1990-04-27 | 1992-01-16 | Nippondenso Co Ltd | Fuel injection device |
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